.toolbar {
    border: 1px solid #ccc;
    height: 30px;
}

.text {
    border: 1px solid #ccc;
    min-height: 400px;
}
.operator{
    text-indent: 20px;
}
.operator button{
    width: 60px;
    height: 30px;
    margin-top:  5px;
    margin-bottom: 5px;
}
